diff --git a/mods/d2k/rules/structures.yaml b/mods/d2k/rules/structures.yaml
index 6de76a261e..5e80875e68 100644
--- a/mods/d2k/rules/structures.yaml
+++ b/mods/d2k/rules/structures.yaml
@@ -403,7 +403,7 @@ CONCRETEB:
 		BuildSounds: CHUNG.WAV
 		SellSounds: CHUNG.WAV
 		Adjacent: 7
-		TerrainTypes: Rock
+		TerrainTypes: Rock, Concrete
 	Health:
 		HP: 300
 	Armor: